diff --git a/test-salt-model-node.groovy b/test-salt-model-node.groovy
index bcc0c8b..eaf0104 100644
--- a/test-salt-model-node.groovy
+++ b/test-salt-model-node.groovy
@@ -23,44 +23,47 @@
 def defaultGitUrl = DEFAULT_GIT_URL
 
 def checkouted = false
-node("python") {
-  try{
-    stage("checkout") {
-      if(defaultGitRef != "" && defaultGitUrl != "") {
-          checkouted = gerrit.gerritPatchsetCheckout(defaultGitUrl, defaultGitRef, "HEAD", CREDENTIALS_ID)
-      } else {
-        throw new Exception("Cannot checkout gerrit patchset, DEFAULT_GIT_URL or DEFAULT_GIT_REF is null")
-      }
-      if(checkouted) {
-        if (fileExists('classes/system')) {
-          if (SYSTEM_GIT_URL == "") {
-            ssh.prepareSshAgentKey(CREDENTIALS_ID)
-            dir('classes/system') {
-              remoteUrl = git.getGitRemote()
-              ssh.ensureKnownHosts(remoteUrl)
-            }
-            ssh.agentSh("git submodule init; git submodule sync; git submodule update --recursive")
-          } else {
-            dir('classes/system') {
-              if (!gerrit.gerritPatchsetCheckout(SYSTEM_GIT_URL, SYSTEM_GIT_REF, "HEAD", CREDENTIALS_ID)) {
-                common.errorMsg("Failed to obtain system reclass with url: ${SYSTEM_GIT_URL} and ${SYSTEM_GIT_REF}")
+
+throttle(['test-model']) {
+  node("python") {
+    try{
+      stage("checkout") {
+        if(defaultGitRef != "" && defaultGitUrl != "") {
+            checkouted = gerrit.gerritPatchsetCheckout(defaultGitUrl, defaultGitRef, "HEAD", CREDENTIALS_ID)
+        } else {
+          throw new Exception("Cannot checkout gerrit patchset, DEFAULT_GIT_URL or DEFAULT_GIT_REF is null")
+        }
+        if(checkouted) {
+          if (fileExists('classes/system')) {
+            if (SYSTEM_GIT_URL == "") {
+              ssh.prepareSshAgentKey(CREDENTIALS_ID)
+              dir('classes/system') {
+                remoteUrl = git.getGitRemote()
+                ssh.ensureKnownHosts(remoteUrl)
+              }
+              ssh.agentSh("git submodule init; git submodule sync; git submodule update --recursive")
+            } else {
+              dir('classes/system') {
+                if (!gerrit.gerritPatchsetCheckout(SYSTEM_GIT_URL, SYSTEM_GIT_REF, "HEAD", CREDENTIALS_ID)) {
+                  common.errorMsg("Failed to obtain system reclass with url: ${SYSTEM_GIT_URL} and ${SYSTEM_GIT_REF}")
+                }
               }
             }
           }
         }
       }
-    }
 
-    stage("test node") {
-      if (checkouted) {
-        def workspace = common.getWorkspace()
-        saltModelTesting.setupAndTestNode(NODE_TARGET, CLUSTER_NAME, EXTRA_FORMULAS, workspace, FORMULAS_SOURCE, FORMULAS_REVISION, MAX_CPU_PER_JOB.toInteger())
+      stage("test node") {
+        if (checkouted) {
+          def workspace = common.getWorkspace()
+          saltModelTesting.setupAndTestNode(NODE_TARGET, CLUSTER_NAME, EXTRA_FORMULAS, workspace, FORMULAS_SOURCE, FORMULAS_REVISION, MAX_CPU_PER_JOB.toInteger())
+        }
       }
+    } catch (Throwable e) {
+       // If there was an error or exception thrown, the build failed
+       currentBuild.result = "FAILURE"
+       currentBuild.description = currentBuild.description ? e.message + " " + currentBuild.description : e.message
+       throw e
     }
-  } catch (Throwable e) {
-     // If there was an error or exception thrown, the build failed
-     currentBuild.result = "FAILURE"
-     currentBuild.description = currentBuild.description ? e.message + " " + currentBuild.description : e.message
-     throw e
   }
 }